Language of login.salesforce.com

It uses your default browser settings to set the language

Here I have set my language to german

And the resulting login page

Once you are logged in, it will use your locale settings in your profile.

As seen before - thanks to CyberJus for your answer - it is possible to change the language based on the browser language.

However, it is possible to overrule this setting by using the url parameter locate. Locate overrules the browser settings and displays the website in any given language:

• https://login.salesforce.com/?locale=de
• https://login.salesforce.com/?locale=fr
• https://login.salesforce.com/?locale=uk
• https://login.salesforce.com/?locale=us